Quote:
Originally Posted by LeftCoaster
why draw the line at 30km?
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Because the data shows that the rate of pedestrian fatalities and severe injuries sharply increases as impact speeds go above 30kph. So if the desire is to get the best effect on fatalities while minimizing the impact to drivers, 30kph is an optimal speed limit.
See:
http://en.wikipedia.org/wiki/Zone_30
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